Abstract
The epizoobiontic bryozoan-community on fronds of Flustra foliacea from 51 stations kept in four German museums was analysed. Sampling covers the entire North Sea and different time periods (1776–2008). Cluster analysis based on presence/absence shows a differentiation into a northern and a southern North Sea assemblage separated along the 50 m depth contour. The northern assemblage is characterized by Amphiblestrum flemingii (Busk), Callopora dumerilii (Audouin) and Tricellaria ternata (Ellis and Solander), while the southern North Sea is characterized by two cyclostome species – Crisia eburnea (Linnaeus), and Plagioecia patina (Lamarck) – and a cheilostome – Electra pilosa (Linnaeus). In the Helgoland Deep Trench (HTR), the occurrence of cyclostomes is more conspicuous than elsewhere, judging from the studied material. The occurrence of erect growth forms increases from the northern to the southern North Sea.
The results show a difference in spatial distribution of epizoobiontic bryozoans on Flustra foliacea in the North Sea. A temporal shift could not be detected in this investigation.
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Acknowledgement
This research was only possible with the help of researchers and curators who made their collection material available. The author is grateful to Dirk Brandis (Zoological Museum, Kiel), Carsten Lüter (Natural History Museum, Berlin), Andreas Schmidt-Rhesa (Zoological Museum, Hamburg), Joachim Scholz and Brigitte Lotz (Forschungsinstitut Senckenberg) and their staff for both discussions and providing the material. My research was supported by Stefan Forster and the University of Rostock (Institute for Biosciences) and by the Senckenberg Research Institute, Department of Aquatic Zoology (Frankfurt am Main). This manuscript benefited much from advice and criticism provided by the late Frank K. McKinney (Boone, NC U.S.A.). Further thanks go to the reviewers Priska Schäfer, Mary Spencer Jones and Steve Hageman for reading and giving further advice on the manuscript.
The present study took place at the Biodiversity and Climate Research Centre (BiK-F), Frankfurt a.M., and was financially supported by the research funding programme “LOEWE – Landes-Offensive zur Entwicklung Wissenschaftlich-ökonomischer Exzellenz” of Hessen’s Ministry for Higher Education, Research, and the Arts.
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Bitschofsky, F. (2013). Distribution over Space and Time in Epizoobiontic North Sea Bryozoans. In: Ernst, A., Schäfer, P., Scholz, J. (eds) Bryozoan Studies 2010. Lecture Notes in Earth System Sciences, vol 143. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-16411-8_1
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